66138522 has 8 divisors (see below), whose sum is σ = 132277056. Its totient is φ = 22046172.

The previous prime is 66138521. The next prime is 66138529. The reversal of 66138522 is 22583166.

It is a sphenic number, since it is the product of 3 distinct primes.

66138522 is an admirable number.

It is not an unprimeable number, because it can be changed into a prime (66138521) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 5511538 + ... + 5511549.

It is an arithmetic number, because the mean of its divisors is an integer number (16534632).

Almost surely, 2^66138522 is an apocalyptic number.

66138522 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

66138522 is a wasteful number, since it uses less digits than its factorization.

66138522 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11023092.

The product of its digits is 17280, while the sum is 33.

The square root of 66138522 is about 8132.5593757439. The cubic root of 66138522 is about 404.4065320957.

The spelling of 66138522 in words is "sixty-six million, one hundred thirty-eight thousand, five hundred twenty-two".